Drilling Unconsolidated Formations

Drilling Unconsolidated Formations

The following techniques should be used while drilling Unconsolidated Formations:

1. Obtain maximum annular velocities by using critical velocity circulating rates.

2. Use a "Clayball Trap" or a small settling tank upstream of the shakers.

3. When reaming, avoid scouring the sides of the hole with high jet velocities. When reaming with a jet bit, run the pumps at reduced speed. If much reaming is anticipated, use a four nozzle bit. Increase the frequency of check trips. Drill with reduced rpm if conditions permit.

Note: Use four nozzle . . .

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